The items will fit in the classic or mini Happy Planner. The stickers will work in the boxes, the checkbox stickers will be a little short but not much. The cards and notepad have holes punched for a A5 or Personal sized ring binder, those holes do not line up with the Happy Planner discs. However, if you trim the holes off and repunch with a disc punch that would work. Hope this helps! It's a really pretty set.